Question about Honda Pressure Washer PSI 3000

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Pressure washer stalls

I have a honda gx340 with a cat 45 pump pressure washer. With water running engine starts sounds good then spits and sputters and cuts out. I took to local engine repair they said fuel was dirty and cleaned the carb. I still have same problem. I took gas tank off drained flushed and flushed carb cleaned filter in tank and it still does the same. I was told by cat the unloader seals might be bad but I took that apart and everything looks good, seals tight. There is a lever on engine that moves when engine starts sputtering maybe a minute after starting. Oil is full, gas is new, hydralic oil is full. Fuel ine looks okay. Spark plug looks good, cap seems good.Any clues? Looks like I'll be renting a pressure washer for my job Monday. Thanks much for any insight.

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  • derekd_tds Dec 01, 2008

    After all that it seems to have been a fouled plug. FYI cleaning a plug sometimes isn't enough try replacing it!

  • Wilf Blum Aug 20, 2012

    Just loosen the gas cap You won't believe it!

  • Wilf Blum Aug 20, 2012

    Just loosen your gas cap! You won't believe it


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Pressure washers work under very dirty conditions, no wonder they encounter engine problems. Here are a few pointers from a former pressure pump tech. The unloader is a source of engine overloading however this can easily be checked with a pressure guage attached to the gun with a tee fitting having the guage and the normal tip used for the unit. The pressure should never rise over rated pressure. The pressure should drop considrably when trigger is released. The life of the pump and engine can be increased by setting max pressure to 75% of rating. Most engine problems are from following conditions:
Leaking or misadjusted valves; clogged muffer /spark arrester; weak spark coil that is about to fail completely; kill switch/oil sensor wiring and or sensor mal function; gas cap not venting properly causing vacuum in tank and wet or dirty air filter.
All these problems easy to check, fastest repair is to disconnect oil sensor wire to check oil safety system. Then temp replace coil with known good coil. Loosen muffer bolts to check for clogged muffler. Temp run engine without gas cap to check for vacuum. Finally if everything fails, run the engine with carb cleaner spraying directly into the intake. If the engine continues to run with carb cleaner then the problem is fuel delivey and faulty carb. enjoy

Posted on Dec 01, 2008

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